example/mapeditor: Bug fix: dragging on the map view shouldn't affect the tileset view

example/mapeditor/mapeditor/input.go

@@ -0,0 +1,37 @@
+// Copyright 2015 Hajime Hoshi
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package mapeditor
+
+import (
+	"github.com/hajimehoshi/ebiten"
+)
+
+type Input struct {
+	mouseButtonStates [4]int
+}
+
+func (i *Input) Update() {
+	for b, _ := range i.mouseButtonStates {
+		if !ebiten.IsMouseButtonPressed(ebiten.MouseButton(b)) {
+			i.mouseButtonStates[b] = 0
+			continue
+		}
+		i.mouseButtonStates[b]++
+	}
+}
+
+func (i *Input) MouseButtonState(m ebiten.MouseButton) int {
+	return i.mouseButtonStates[m]
+}

example/mapeditor/mapeditor/maineditor.go

@@ -30,6 +30,7 @@ const (
 )
 
 type MainEditor struct {
+	input        Input
 	tileSetView  *TileSetView
 	tileSetPanel *Panel
 	mapView      *MapView
@@ -58,11 +59,13 @@ func NewMainEditor(tileSet *TileSet, m *Map) (*MainEditor, error) {
 }
 
 func (m *MainEditor) Update() error {
-	if err := m.tileSetView.Update(tileSetX, tileSetY); err != nil {
+	m.input.Update()
+
+	if err := m.tileSetView.Update(&m.input, tileSetX, tileSetY, TileWidth*TileSetXNum, TileHeight*TileSetYNum); err != nil {
 		return err
 	}
 	tileSet := m.tileSetView.tileSet
-	if err := m.mapView.Update(mapViewX, mapViewY, mapViewWidth, mapViewHeight, tileSet, m.tileSetView.selectedTile); err != nil {
+	if err := m.mapView.Update(&m.input, mapViewX, mapViewY, mapViewWidth, mapViewHeight, tileSet, m.tileSetView.selectedTile); err != nil {
 		return err
 	}
 	return nil

example/mapeditor/mapeditor/mapview.go

@@ -20,21 +20,22 @@ import (
 )
 
 type MapView struct {
-	m       *Map
-	tileSet *TileSet
-	cursorX int
-	cursorY int
+	m        *Map
+	tileSet  *TileSet
+	cursorX  int
+	cursorY  int
+	dragging bool
 }
 
 func NewMapView(m *Map) *MapView {
 	return &MapView{
 		m:       m,
-		cursorX: -1,
-		cursorY: -1,
+		cursorX: 0,
+		cursorY: 0,
 	}
 }
 
-func (m *MapView) Update(ox, oy, width, height int, tileSet *TileSet, selectedTile int) error {
+func (m *MapView) Update(input *Input, ox, oy, width, height int, tileSet *TileSet, selectedTile int) error {
 	m.tileSet = tileSet
 
 	x, y := ebiten.CursorPosition()
@@ -48,7 +49,14 @@ func (m *MapView) Update(ox, oy, width, height int, tileSet *TileSet, selectedTi
 	}
 	m.cursorX = x / TileWidth
 	m.cursorY = y / TileHeight
-	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
+	if input.MouseButtonState(ebiten.MouseButtonLeft) == 0 {
+		m.dragging = false
+		return nil
+	}
+	if input.MouseButtonState(ebiten.MouseButtonLeft) == 1 {
+		m.dragging = true
+	}
+	if m.dragging && ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
 		m.m.SetTile(m.cursorX, m.cursorY, selectedTile)
 	}
 	return nil

example/mapeditor/mapeditor/tilesetview.go

@@ -22,6 +22,7 @@ import (
 type TileSetView struct {
 	tileSet      *TileSet
 	selectedTile int
+	dragging     bool
 }
 
 func NewTileSetView(tileSet *TileSet) *TileSetView {
@@ -30,18 +31,31 @@ func NewTileSetView(tileSet *TileSet) *TileSetView {
 	}
 }
 
-func (t *TileSetView) Update(ox, oy int) error {
-	if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
-		x, y := ebiten.CursorPosition()
-		x -= ox
-		y -= oy
-		if 0 <= x && 0 <= y && x < TileWidth*TileSetXNum && y < TileHeight*TileSetYNum {
-			tile, err := t.tileSet.TileAt(x, y)
-			if err != nil {
-				return err
-			}
-			t.selectedTile = tile
+func (t *TileSetView) Update(input *Input, ox, oy, width, height int) error {
+	x, y := ebiten.CursorPosition()
+	x -= ox
+	y -= oy
+	if x < 0 || y < 0 || width <= x || height <= y {
+		return nil
+	}
+	if TileWidth*TileSetXNum <= x && TileHeight*TileSetYNum <= y {
+		return nil
+	}
+	if input.MouseButtonState(ebiten.MouseButtonLeft) == 0 {
+		t.dragging = false
+		return nil
+	}
+	if input.MouseButtonState(ebiten.MouseButtonLeft) == 1 {
+		t.dragging = true
+	}
+	// TODO: Implement dragging to select multiple tiles.
+
+	if input.MouseButtonState(ebiten.MouseButtonLeft) == 1 {
+		tile, err := t.tileSet.TileAt(x, y)
+		if err != nil {
+			return err
 		}
+		t.selectedTile = tile
 	}
 	return nil
 }